What are the rules for playing with Marchesa, the Black Rose in a game of Magic: The Gathering?

When playing with Marchesa, the Black Rose in Magic: The Gathering, remember these key rules:

1. Marchesa's ability triggers when a creature you control dies, returning it to the battlefield under your control at the beginning of the next end step.
2. Marchesa grants all your creatures with 1/1 counters the ability to return to the battlefield if they die.
3. Marchesa's ability only triggers if you control Marchesa at the time the creature dies. Remember to strategize and utilize Marchesa's abilities effectively to gain an advantage in the game.